A reliable and rapid pharmacokinetic study of pueraria isoflavones using pueraria reference extractive substance in beagle plasma: Application to study of Yufeng Ningxin Tablets.

Objective: In order to evaluate the reliability and feasibility of pueraria reference extractive substance (RES) used in biological sample, the pharmacokinetics of 3'­hydroxy puerarin (3'-HP), puerarin, 3'­methoxy puerarin (3'-MP), and daidzein-8-C-apiosyl-(1-6)-glucoside (DAG) in beagle plasma following oral administration of Yufeng Ningxin Tablet were quantitated. Methods: A reliable and sensitive high-performance liquid chromatography-tandem triple quadrupole mass spectrometry (HPLC-QQQ-MS/MS) method developed with chromatographic separation was operated on a Merck C18 column, and acetonitrile-5 mmol/L ammonium was used as mobile phase in gradient elution. The plasma samples were deproteinized by acetone, detected by triple quadrupole mass spectrometry with an electrospray ionization interface, and quantified using selected ion monitoring mode. The pharmacokinetic parameters were calculated by Winnonlin 4.1. Results: The calibration curves of the reference extractive substance and standard substance methods were linear over the ranges 0.0417-11.3309 µg/mL and 0.0394-10.0000 µg/mL. The intra-day and inter-day precision of the two methods at three concentrations were less than 13.63%, and the average recoveries of 3'-HP, puerarin, 3'-MP, and DAG were more than 70.67%. The RSD of the mean plasma concentrations of the analytes calculated by the two methods was less than 5%, and cos (ϑ) = =1.000. Among the analytes, puerarin showed the highest blood concentration [(940 ± 185) ng/mL] and the longest retention time [(5 ± 1) h] in the dog's bodies. Conclusion: Pueraria reference extractive substance can be seen as an alternative to the standard substance to overcome the scarcity of standard substance for the analysis of biological samples.